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Gartner predicted that a growing number of Android smartphone users will migrate to Apple's iOS in 2015, as it forecast that mobile phones and tablets will lead growth in global device shipments during the year.

After a difficult year in 2014, the global tablet market is not returning to the levels of growth seen in the last four years as demand for tablets will continue to be slow in 2015 according to latest research from Gartner.

Apple continued to benefit from the launch of the iPhone 6 and iPhone 6 Plus in the three months to the end of November 2014, with the iOS operating system increasing its market share in Europe as well as in all other markets except for Japan as surveyed by Kantar Worldpanel ComTech.

Xiaomi posted $56.1 million (347.5 million yuan) in net profit last year, according to a regulatory filing. The filing provides a glimpse inside the finances of privately owned Chinese smartphone vendor Xiaomi, which has rocketed up the rankings to become one of the world's top smartphone brands in the past few quarters.